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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 47 · 40 questions
TalentJR

The trick (Chain the factors): Split the multiplier into two small factors: 12 = 3 × 4, 14 = 2 × 7, 15 = 3 × 5, 16 = 4 × 4, 18 = 2 × 9, 24 = 4 × 6. Multiply by the first factor. Multiply that answer by the second factor (× 4 is double, double).

NameDateTime takenScore ___ / 40
  1. 1.11 × 14 =
  2. 2.33 × 24 =
  3. 3.43 × 16 =
  4. 4.48 × 15 =
  5. 5.31 × 14 =
  6. 6.11 × 18 =
  7. 7.16 × 16 =
  8. 8.33 × 16 =
  9. 9.29 × 24 =
  10. 10.42 × 15 =
  11. 11.30 × 18 =
  12. 12.36 × 16 =
  13. 13.20 × 14 =
  14. 14.15 × 18 =
  15. 15.20 × 12 =
  16. 16.41 × 14 =
  17. 17.12 × 16 =
  18. 18.38 × 15 =
  19. 19.29 × 16 =
  20. 20.11 × 24 =
  21. 21.17 × 16 =
  22. 22.46 × 18 =
  23. 23.13 × 14 =
  24. 24.11 × 12 =
  25. 25.22 × 18 =
  26. 26.27 × 24 =
  27. 27.30 × 12 =
  28. 28.14 × 12 =
  29. 29.43 × 15 =
  30. 30.40 × 18 =
  31. 31.43 × 12 =
  32. 32.17 × 14 =
  33. 33.47 × 18 =
  34. 34.16 × 18 =
  35. 35.38 × 12 =
  36. 36.25 × 15 =
  37. 37.17 × 24 =
  38. 38.26 × 18 =
  39. 39.20 × 16 =
  40. 40.23 × 12 =

Answer key

  1. 154
  2. 792
  3. 688
  4. 720
  5. 434
  6. 198
  7. 256
  8. 528
  9. 696
  10. 630
  11. 540
  12. 576
  13. 280
  14. 270
  15. 240
  16. 574
  17. 192
  18. 570
  19. 464
  20. 264
  21. 272
  22. 828
  23. 182
  24. 132
  25. 396
  26. 648
  27. 360
  28. 168
  29. 645
  30. 720
  31. 516
  32. 238
  33. 846
  34. 288
  35. 456
  36. 375
  37. 408
  38. 468
  39. 320
  40. 276

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